Repeater switching system



Nov. 10, 1953 F. B. BRAMHALL EI'AL 2,653,945

7 REPEATER SWITCHING SYSTEM Filed May 31, 1951 2 Sheets-Sheet l :w 4. wzi 1.

Mail I T ORNEY INVENTORS. F. s. BRAMHALL E. L. NEWELL P. H. WELLS c. H. CRAMER TO FIG. 2-

295.5 ll! uzazmm o.

Patented Nov. 10, 195 3 STATES TENT QFFICE REPEATER SWITCHING SYSTEM Application May 31, 1951, Serial No. 229,191

15 Claims. 1

The present invention relates to electrical repeaters and more particularly to submersible electrical repeaters for use with submarine cables.

As indicated in copending patent application of H. F. Wilder, Serial No. 229,146, filed concurrently herewith, speed, quality and reliability of service of submarine cables can be greatly improved through the use of repeaters intermediate the shore terminals. Due to the high cost of raising and repairing a submerged repeater, it is desirable that a submerged repeater have as long a life as possible. The life of a submerged repeater can be greatly extended through the used of high quality components and, in particular, long life tubes. However, since latent defects in tubes and other circuit components can not always be detected in advance, it is desirable that a submerged repeater be supplied with spare components and that means controllable from the shore be provided for switching spare components into service.

When a submerged repeater is included in a submarine cable circuit, it is desirable that various tests, both with and without the repeater in the circuit, be available properly to maintain the submarine cable. For instance, in locating cable faults it is desirable to be able to switch the repeater out of the cable circuit. These various tests require switching apparatus located at the repeater and controllable from a shore station. For operating the cable in the reverse direction, it is also desirable to be able to switch the repeater out of the cable circuit.

Accordingly, it is an object of the invention to provide switching and control apparatus suitable for use with a submerged repeater in a submarine cable.

More specifically, it is an object of the invention to provide switching apparatus in a submerged repeater circuit and control apparatus therefor at a shore station.

Another object of the invention is to provide reliable and positive acting switching and control apparatus for a submerged repeater.

Further objects of the invention will appear from the following description.

In accordance with the invention, these objects are achieved by providing, at the submerged repeater station, multi-position switching apparatus and operating means therefor and additional apparatus for selectively placing the switching apparatus in the cable circuit and by providing, at the shore station, means for selectively operating the switching apparatus and the additional apparatus. It is desirable that cables, A. C. magnet 26 may the switchingapparatus provide a plurality of testing and operating connections including a connection in which the cable circuit is cut through directly. In a preferred embodiment of the invention, D. C. stepping pulses operate the switching apparatus while trains of A. C. switching pulses selectively place the repeater circuit in switching and operating conditions.

The invention will now be described in greater detail with reference to the appended drawing in which:

Fig. 1 illustrates a repeater switching circuit arrangement in accordance with the invention; and

Fig. 2 illustrates control apparatus at a shore station for use with the circuit arrangement of Fig. 1.

Referring now to the drawings and more particularly to Fig. 1, there is shown a three-level rotary switch S. Levels ll, I2 and I3 of switch S each have ten contacts wiped, respectively, by wipers i4, i5 and H6. The wipers are caused to step one contact at each operation of a D. C. stepping magnet ll. Stepping magnet I1 is energized through a circuit which may be traced from ground, through the winding, of magnet il, conductor 18, front contact l9 and tongue 20 of switch it, conductor 22, conductor 23 of cable 24, a source of direct potential at the shore station (not shown) and ground. Stepping magnet il is energized once for each pulse of direct current received over cable 25.

Switch 2! is caused to operate from its front contact iii to its back contact 25 by energization of an A. C. magnet 25, the winding of which is shunted across conductor 22 and ground.

Since A. C. magnet 26 is shunted across the cable circuit, it should respond solely to A. C. switching pulses having frequencies outside the intelligence signaling frequency band. Magnet 26 should have a relatively high impedance with respect to intelligence signal frequencies and a relatively low impedance with respect to switching pulses. This is accomplished by placing a capacitor Cv in series with magnet 26 to form a series resonant circuit tuned to the frequency of the A. C. switching pulses. With low speed conveniently be caused to respondto currents of cycles. Armature 21 of magnet 26 operates a ratchet 28 which, in turn, rotates a crank 29. Crank 29 is coupled to tongue 26 through a spring 30 so that rotatlOl'l. of crank 29 operates tongue 26 back and forth between front contact l9 and back contact 25. A predetermined number of A. C. switching 3 pulses, for instance, fifteen, applied to magnet 26, each pulse producing one step of ratchet 28, will rotate crank 29 suihciently to operate switch 2!.

tQng e is o ected w th iront C tact l9, D. C. stepping magnet H is connected across the cable circuit and D. C. stepping pulses may be applied thereto to cause stepping of switch S. After application of the desired num' ber of D. C. pulses to stepping magnet IT. the predetermined number of A, C. switchin pulses may be applied to magnet 26 to operate ton ue 20 to back contact 25. circuit is connected to a conductbr 31,

At this time'the cable When further stepping of switch S is desired, applicafl tion of the predetermined number of A. C. switching pulses to magnet 26 will operate tongue 20" to back contact l9, connecting D. C. stepping dliiltQf '23 is'connectedtnrough directly to cable conductor 33.

Studs and 5thr'ough Qof level H are interconnected by a conductor 35, while studs 4 and) thereof are'Ope'nJ Studs 4 ana'ie of level 82 are open, while studs 2, 3 and 9 and 5, 6 and'ii'ther'e'of are interconnected, respectively, by"ccnductor's 3'3 and 31; Stud? of level i2 is connected to one end of a resistor 38. Studs 4 and '6 through ii] of 1'evel'l3 are'open, while studs 2, 3, 5 'andfi thereof are interconnected by a conducto 3 Conductor 39' is connected to one end of the primary winding of an input transformer ii] thrcujgna'shaping network 4!. The other 'end of the primary winding'of transformer 48 is connected to the cable ground'thr'o'ugh'a conductor 52, Theicable'ground connection'is carried back alon'g'the cablefor"aconsiderable distance, pref- 'e r ly about one-ouarter mile, to avoid feedback wh ch'ini'ght result from common input and output'fgrounds, For this urpose the'sec'tio'n of cable 36 "adjacent'tothe r'ep'eater'statiouconsists 'of a bicor'e'c'able having'condiictor's' 33 and 42: Conductor 42 is finally earthed on the cable armor wires;

Ihe secondary winding of transformer is 'coupledto two parallel "connected'repeating am.- pl-ifiers'A and'B,which may be of any suitable type 'designe'd to operate with small power 'requirements. A- suitable amplifier circuit is illustr 'ated-in-thecopending patent application of R'HJ Wells etal; Serial'No. 229,193, filed'concurrently herewith.- The'ce'nter' tap of the secondary windingbf transformer '43 is "connected to wiper! 5 and to conductor 35.

The outputs of amplifiers A'andB are coupled to the 'pri-mary winding of'an output transformer 43: Oncend of the secondary of transformerfl, whichds shuntedqby a resistor "44, is connected to groundwhile the otherend thereof is 'co'u pled-tobonductor 35 through apapaci'tor 45.

- Interconnected studs 2 and It of level l2 are coupled through the Series connected tube heaters 46 of amplifier-"A and through resistors '41 and 44 to ground; Interconnected'stud's 5 and 6 ofle'vel 12 'are coupled through the" series connected tube heaters t-80f amplifier Band through resistors =4! and- 44 to'ground; Stud? "of level !2 is connected through resistors 38, 41" and '44 to ground. The resistance of resistor 38 is chosen substantially equal to the operating resistance values of the amplifier tube heaters. Wiper l5 and conductor 35 are interconnected by a conductor 49.

When wipers l4, l5 and I6 are resting on the respective first studs of levels I I, I2 and I3, cable conductor 23 is directly connected with cable conductor 33, amplifiers A and B being completely out otthe cable circuit. This connection is desired for making certain cable tests, for operating the'cable without the repeater, for operating the 'cable in the reverse direction when a secone-repeater is installed near the other end of "the cable, and for maintaining service in the event of repeater failure.

When wipers 14, i5 and I6 are resting on respective studs 2 or 3 of levels I I, I2 and I3, the cable circuit is completed through amplifier A. The signal may be traced from cable conductor 33 through wiper I6, conductor 39, shaping networl'i' 4|, transformer, amplifier A, transformer 43'," capacitor 45, conductor 35', wiper I4, conductor 3|; tongueZO, and conductor 22 to cable conductor 23;"The tube heating circuit for amplifier A is completed'from conductor 23 through conductor 22, tongueifi, conductor 3|, wiper I4, conductor 35, conductor 49, wiper l5,"heaters 46, resistor 47 and resistor'44' to ground.

When'wipers '14, i5 and I6 are'resting on respective studs 4 or it! of levels ll, l2 and |3,'the cable circuit, as viewed from either the sending or the receiving station, is open and available for desired open cable tests.

When wipers 1:3,15 and i6 are resting on respective studs 5 or t of levels 1 I, I2 and 'I3,'the cable'circuit 'iscompieted through amplifier B. Itwfll'be noted that in this 'connectionheaters 48 of amplifier'Bare supplied with current rather than heaters 46;

When wipers l4, l5 and" I6 are resting on respective studs "oflevelsll, |2'and"i3, the cable circuitfromfthe' sending station is open, whilethe 'cablecircuiufrom the'receiving sta tiorris'completed-through resistor 38 so that tests mayibe" made' fro'm the receiving station with a resistance value substantially equal to 'the amplifier tube heater operating resistance.

When wipers M, l5 and 16 are're'sting on respeccve wss 8 'or 9 of levels I 3, l2 and '13, the

cams circuitfrom' the sending station is open, whilethe'cable circuit from the receiving stae tiori is completed 'through'heaters 48 or 46, respectively In these connections tests may be m'ade-withthe' amplifier inputs open and'their heaters operating.

In normal operation of the submarine cable, the cable circuit will be completed through either amplifier'A'or'Bt When it is desired to shift froinnne to the otherampl'ifier or to shift to one of the testing positionsdescribed 'hereinbefore, a-pr'edetcrminednumber of AC. switching pulses are transmitted fromthe receiving Station to energize -A." Q'Qmagnet 26; thereby to, operate tongue" 29 from ba-ck 'contact' 25 to'front contact Hi. When tongueiilis restingjon contact l9,'a numberz of 'fp C. stepping pulses equal to the number of studs desiredto be stepped is transmitted over thejca ble; each stepping pulse operating stepping magrietdl and causing wipers l4, l5an'di6 each tostep one stud. After completion ofthe 11C. stepping, the predetermined number of A, Gist/itching pulses is again transmittedfover"thecablefrom the receiving station tooperate"t0ngue"20 backto contact 25. The

testing and operating positions described hereinbefore are given for purposes of illustration only as other conditions could be provided. For instance, a single amplifier with various combinations of replacement tubes could be provided.

Referring now to Fig. 2, which describes receiving station apparatus for use with the arrangement of Fig. 1, cable conductor 23 may be connected either to a signal amplifier and power supply 50 or to conductor 6| by means of a plug 62. Conductor 6| is connected to an armature 63 operated by a polar relay 05 having two windings 65 and 66. When winding 65 is energized, armature 63 makes with back contact 67. When winding 66 is energized, armature 63 makes with front contact 68. Contact 61 is supplied with a positive potential from a voltage divider 69 through an ammeter i0 and a resistor H.

Contact 58 is connected to a tongue E2 of a manual switch 73. When tongue I2 is connected to a contact I4, a positive D. C. stepping voltage is supplied to contact 58 from a tapping on voltage divider 59 through a resistor i5. When tongue 12 is connected to a contact I5, an A. C. switching voltage is applied to contact 68 from a transformer Ti coupled to a source of A. C. potential PL.

Windings 85 and 86 of relay 54 are connected in series, respectively, with windings i8 and iii of a polar relay 80, one end of each of windings 65 and 66 being connected to ground. Energization of winding 73 causes an armature 8! to 0perate to an open back contact 82, while energization of winding 19 causes armature 82 to operate to a contact 83. source of positive potential. Armature 8! is connected to ground through the winding of a counter 84. The dial of counter 86 is advanced one digit each time current is supplied thereto. The free ends of windings I8 and T9 are connected, respectively, to tongues 85 and 86 of a double pole double throw switch 81. Tongues 85 and 85 may connect, respectively, with contacts 88 and 85, which are connected, in turn, to segments 99 and 9! of the outer ring of a distributor 92. The

inner ring of distributor 92 is connected to a source of positive potential.

In the normal unoperated position of distributor 92, brushes 03 thereof interconnect the inner ring and segment 00 of the outer ring, thereby applying positive potential to contact 88. When stop $34 is pulled back, the brushes are released and permitted to make one revolution, during the course of which brushes 93 interconnect the inner ring and segment SI for a predetermined time interval. During this time interval positive potential is applied to contact 80. For reasons which will be set out hereinafter, this predetermined time interval is made equal to the time required for the desired predetermined number of A. C. switching pulse cycles applied to magnet 25at the frequency of supply PL.

Stop 94 is operated by a magnet 95, the winding of which is connected between ground and a contact 96 of a push button switch 97. Tongue 9B of switch W is normally connected to a contact 99 coupled to a source of positive potential, thereby supplying charging current for a capacitor W9. When tongue 98 is operated to contact 98, capacitor I00 discharges through magnet 95, thereby operating stop 94 and permitting brushes 93 to rotate. After one revolution stop 9 is again interposed in the path of brushes 93. To insure that stop 94 permits only one revolution, the dis- Contact 83 is connected to a charge time constant of capacitor I00 should be made relatively short.

Contacts IOI and I02 of switch 81 are connected, respectively, to tongues I03 and I04 of a switch I05. Contacts I05 and I0? of switch I05 are each connected to a source of positive potential. When switch I05 is in its upper position, contact I07 and tongue I04 are closed while contact I06 and tongue I03 are open.

The operation of the circuit arrangement of Fig. 2 will now be described. Assume that initially switch I3? is in its left hand position, switch 9'! in its upper position, switch 13 in its left hand posi- 'tion, and plug 62 connected to conductor 6!.

Positive battery will be applied to series connected windings 65 and I8 through the inner ring of distributor 92 and segment 9E3, causing tongues SI and 63 to make with contacts 82 and 61, respectively, Positive battery will be applied to the cable circuit through ammeter I0, the meter reading providing an indication of the switching position at the repeater. When switch 91 is moved to its lower position, brushes 93 are caused to make one revolution on distributor 82 as hereinbefore described. During the time interval that brushes $5 interconnect the inner ring and segment 9i, windings 78 and 65 are deenergized, while windings I9 and 6'5 are energized, causing armatures SI and 55 to make with contacts 83' and 5%, respectively. Positive battery is therefore applied to counter 35, causing the count thereof? to advance one digit. Alternating current from.

source PL is applied to the cable circuit through: contact 88 and armature 53, the number of cycles applied being sufficient to operate switch 2 I at the repeater. As soon as brushes es again contact segment 90, windings i9 and 65 become deenergized and windings "E8 and 65 become energized, returning the circuit to its previous condition. The operations described could have been controlled manually by placing switch 8? in its right hand position and using switch I95 selectively to energize windings i8 and I55 and i9 and 64.

After the completion of the operations set forth, tongue 25 of switch 2! at the repeater will be made with contact I9, placing D. C. stepping magnet 51 across the cable circuit. Switch '53 should now be moved to its right hand position so that D. C. stepping pulses instead of A. C; switching pulses will be sent out over the cable. It should be noted that the D. C. testing pulses transmitted through ammeter are much lower in magnitude than the D. C. stepping pulses so that the D. C. testing pulses will not operate magnet H.

If switch Ei'iis in its left hand position, switch 9? may be operated to its bottom position, initiating the sequence of operations described above. However, in this case a D. C. stepping pulse instead of an A..C. switching pulse will be transmitted. The operation isrepeated until the desired number of steps of switch'S at the repeater have been achieved. At this time switch 13 is again returned to its left hand position and switch 91 operated to send out the train of A. C. switching pulses necessary to operate switch 2i back to contact 25. Plug 62 may now be connected to amplifier and power supply 60 or to a testing position (notshown).

Since the duration of the train of A. C. switching pulses is relatively critical, it is advisable that distributor 92 be employed'for proper timing. For D. C, stepping, however,.manual switch I05 may be used for faster operation. With switch 87 i1;

ages-spas ment or iromotherlcauses, the counteriindication Wil h e oneous. More .precise determination of 1211? witching position achieved will :be obai fi by Operating switch :2! :to.contact 25 and pservi-ng the def ection :on zmeter Hi. For in.- stange, open indications are produced six steps apart, the sinth step ,w-illlcorrespond rto studs of switch S. :If the open indications are four steps apart, the :fQurth step will correspond to s uds lo swi ch-s.

It is evident that ;the circuit arrangementdecribed could be lop ratedcwith negative pot tials instead of the positive potentials described.

il the nvention has been d scribed in a speci-ncernbodiment thereof andin a specific use,

it ;is not d fii ifid :lihat .it :be limited thereto, for

obvious modificatiqns ,thereof will .occur to those slg l led in the ant Without departing ,from the sp rit a d .ficQpeoi the invention as set forth in the pc idedcla ms.

5, l bP, b repeater for incorporation in filhm fi fi cable circuit, comprising an :electronic amplifier, a first switchin means associated therewith, said first switching means having ,a p rality of switching positions for select e y n p dins a plurality of te n a plify ing and operating QQnditionsin said cable circuit, p tioning means responsive .to positioning pulses received over said cablepircuit for operatme a d rs sw tc in means from one to a herpf sa d switch n positions thereof, s c n switching mean ior selectively connecting either sa d fir s i chin mea s or said positionin m an i t said able ircu operating means es ons ve t switch-ms s na ec ived over sa cable c c it or opera-t ns sa d second Switching ans and me ns or permanently ca -t e, ope at ng means to sad ca le c u ai p ratin m ans havin lush, pedance value with respect to intelligence-gig received e sa d cable r ui and low mp an value i h r pec to aid sw tchin signal.

A submersible repeater for incorporation in a submarine cable circuit, comprising first switching means, saidfirst switching means ,having a plurality of switching positions for selectively providing a plurality of testing and operating ndi n i saidcable circuit, st ppi means responsive to direct current stepping pulses received over said cable circuit for operating said first switchin means from one to another of said switching positions thereof, said stepping means being arranged to be selectively disconnected from said cable circuit, second switching means for-selectively connecting either said first switching means or said stepping means into said cable circuit, operating means responsive to a train oi-alternating current switching pulsesreceived over said cable circuit for operatin SaidESeCOIIdSWiEChiIIg means, and :means for permanently connecting saidloperating meanscto said-cable,circuit saidoperating .means having .a high impedance value (with respect to intelligence signals received oversaid cable circuit and. a low impedance ivalue -.with respect to said switching pulses.

3. submersible repeater :for incorporation in -a -.:si-mplex submarinelcable circuit having a .receivingcable-section and a sending cable section connected, respectively, to .a receiving terminal anda senclingaterminal, comprising first switch- .ing .means, said first switching means having a plurality of :switching positions .for selectively providing .a plurality of testing and operating conditions in said cable circuit, a stepping imaginet responsive to direct current 'steppingpulses received loversaid receiving cable section for operating said first switching :means from one to :anotherof saidswitching positions thereof, second switching means :for selectively connecting either said first switching means or said stepping means to said receiving cable section, means in ,cluding an alternating current magnet and ing responsive to a predetermined number of alternating current switching pulses received over said receiving cable section for operating .said .second switching means, and means for permanently connecting said alternating current magnet to said cable circuit, said alternating current magnet having 'a high impedance value with respect to intel-ii ence signals received over said sending cable section and a low impedance value with respect to said switching pulses.

4. A submersible repeater for incorporation in a submarine cable circuit, comprising a plurality of electronic amplifiers each having an input circuit and -an output-circuit and each having a tube heater circuit, first switching means, said first switching means having a plurality of switching positions for selectively operatively connecting said-electronic amplifiers in said cable circuit and for selectively providing a plurality of testing and operating conditions-in said cable circuit, stepping means responsive to stepping pulses received over said cable circuit for operating said first switching-means from one to an other of said switching positions thereof, said stepping means being arranged to be selectively disconnected from said cable circuit, second switching means for selectively connecting either said first switchingmeans'or said stepping means into said cable circuit, operatingmeans responsive-to a switching signal received over said cable circuit for operating said second switching means, and means :for permanently connecting said operating means to said cable circuit, said operating means having electrical characteristics which render it ncnrespcnsiveto intelligence sig nals receivcdover said cable circuit.

5. A submersible repeater for incorporation in a submarine cable circuit, comprising a plurality of electronic amplifiers having common input circui s and common output circuits and each having a tube heater circuit, first switching means, said firstswitching means having a pinrality of switching positions for selectively operatively connecting said electronic amplifiers in said cable circuit and for selectively providing a plurality of testing and operating conditions in said cable circuit, stepping means responsive to direct current stepping pulses received over said cable circuit for operating said first switchingmeans from one to another of said switching positions thereof, second switching means for selectively connecting either said first switching means or said stepping means into said cable circuit, operating means responsive to a train of alternating current switching pulses received over said cable circuit for operating said second switching means, and means for permanently connecting said operating means to said cable circuit, said operating means having electrical characteristics which render it nonresponsive to intelligence signals received over said cable circuit.

6. A submersible repeater for incorporation in a submarine cable circuit intercoupling a sending terminal and a receiving terminal, comprising a plurality of electronic amplifiers having common input circuits and common output circuits and each having a tube heater circuit, first switching means, said first switching means having a plurality of switching positions for selectively connecting said input and output circuits into said cable circuit, for selectively connecting said tube heater circuits into said cable circuit and for selectively providing a plurality of testing and operating conditions in said cable circuit, a stepping magnet responsive to direct current stepping pulses received over said cable circuit from said receiving terminal for operating said first switching means from one to another of said switching positions thereof, second switching means for selectively connecting either said first switching means or said stepping magnet to said cable circuit, operating means including an alternating current magnet and being responsive to a predetermined number of alternating current switching pulses received over said cable circuit from said receiving terminal for operating said second switching means, and means for permanently connecting said alternating current magnet to said cable circuit, said alternating current magnet having a high impedance value with respect to intelligence signals received over said cable circuit from said sending terminal and a low impedance value with respect to said alternating current switching pulses.

'7. A submarine cable circuit, comprising a submersible repeater interposed in a ubmerged portion of said cable circuit and including first switching means, said first switching means having a plurality of switching positions for selectively providing a plurality of testing and operating conditions in said cable circuit, stepping means responsive to stepping pulses received over said cable circuit for operating said first switching means from one to another of said switching positions there-of, second switching means for selectively connecting either said first switching means or said stepping means into said cable circuit, operating means responsive to a switching signal received over said cable circuit for operating said second switching means and means for permanently connecting said operating means to said cable circuit, said operating means having electrical characteristics rendering it nonresponsive to intelligence signals received over said cable circuit, and a shore station comprising intelligence signaling apparatus, control signaling apparatus and means for connecting either said intelligence signaling apparatus or said control signaling apparatus into said cable circuit, said control signaling apparatus comprising a switching circuit including third switching means for applying either said stepping pulses or said switching signal to said cable circuit.

8. A submarine cable circuit, comprising a submersible repeater interposed in a submerged portion of said c e cir u t and including first switching means, said first switching means having a plurality of switching positions for selectively providing a plurality of testing and operating conditions in said cable circuit, stepping means responsive to stepping pulses received over said cable circuit for operating said first switching means from one to another of said switching positions thereof, said stepping means being arranged to be selectively disconnected from said cable circuit, second switching means for selectively connecting either said first switching means or said stepping means into said cable circuit, operating means responsive to a switching signal received over said cable circuit for operating said second switching means and means for permanently connecting said operating means to said cable circuit, said operating means having electrical characteristics rendering it nonresponsive to intelligence signals received over said cable circuit, and a shore station comprising intelligence signaling apparatus, control signaling apparatus and means for connecting either said intelligence signaling apparatus or said control signaling apparatus into said cable circuit, said control signaling apparatus comprising a testing circuit for applying a testing current to said cable circuit, a switching circuit including third switching means for applying either said stepping pulses or said switching signal to said cable circuit and fourth switching means for selectively connecting either said testing circuit or said switching circuit into said cable circuit.

9. A submarine cable circuit, comprising a submersible repeater interposed in a submerged portion of said cable circuit and including first switching means, said first switching means having a plurality of switching positions for selectively providing a plurality of testing and operating conditions in said cable circuit, stepping means responsive to direct current stepping pulses received over said cable circuit for operating said first switching means from one to another of said switching positions thereof, second switching means for selectively connecting either said first switching means or said stepping means into said cable circuit, operating means responsive to a predetermined number of cycles of alternating current switching pulses received over said cable circuit for operating said second switching means and means for permanently connecting said operating means to said cable circuit, said operating means having electrical characteristics renderin it nonresponsive to intelligence signals received over said cable circuit, and a shore station comprising intelligence signaling and repeater power supply apparatus, control signaling apparatus and means for connecting either said intelligence signalin and repeater power supply apparatus or said control signaling apparatus into said cable circuit, said control signaling apparatus comprising a testing circuit for applying a testing current to said cable circuit, a switching circuit including third switching means for applying either said direct current stepping pulses or said plurality of cycles of alternating current switching pulses to said cable circuit and fourth switching means for selectively connecting either said testing circuit or said switching circuit into said cable circuit.

10. A submarine cable circuit, comprising a submersible repeater interposed in a submerged portion of said cable circuit and including first switching means, said first switching means having a plurality of switching positions for selectively providing a plurality of testing and operatin -conditions" in saidcable circuit; a stepping magnet responsive todirect current stepping pulses-received over said-"cable circuit for operating said first switching means from one to another of said switching positions thereof; second switching means for selectivelyconnecting either said first switching means-or said stepping magnet into said cable circuit, operating means responsive to a predetermined number ofcyclesof alternating current switching pulses received over-said cable circuit for operating said second switching means and-means for permanently conmeeting said operating means to said cable circuit, said operatingmeans having-electrical characteristics renderingit nonresponsive to intelligence signals receivedover-said cable circuit, and a shore receiving station comprising intelligence receiving and repeater power supply apparatus, control signaling apparatus and'means for connectingeither said intelligence receiving-and repeater powersupply apparatus orsaidcontrol signaling apparatus intosaidcable circuit, said control signaling apparatus'comprising atestingcircuit for applying a testing current to said cable circuit; a switching circuit including third switching means for-applying'eithersaid direct current stepping pulses or said predetermined numberof cycles of alternatingcurrent switching pulses tosaid cable circuit and' fourth' sw-itching' means for selectively-connectingeither said testing circuit orsaid switching ci'rcuitinto said cable circuit.

11. Shore station apparatus for use with a submarine cable circuit having a submersible repeaterinterposedin a submerged portion thereof; comprisingintelligence signaling'and repeater power supplyapparatus, controlsignaling. apparatus, and means forconnecting either said intellig-ence signaling and' repeater power supply apparatus or said control signaling apparatus to said cable; circuit, said control signaling apparatus comprising atesting circuit for applying a-testing current to saidcable circuit, a switching circuit including firstswitching means for applying eitherstepping pulses or a switching signal to said'cablecircuit, second switching means'for selectively connecting either said testing circuit or said switching circuit into said cable circuit, and third switching means adapted -to control the said second switchin means.-

12. Receiving shore station-apparatus for use with a submarine cable circuit having a submersible repeater interposed in asubmerged portion thereof; cemprising intelligence receivingand repeater' power supply: apparatus, and means for connecting either said intelligence receiving and repeater power supply-apparatus or-said control signaling apparatus to said cable circuit; said control signaling app aratuscomprising a testing circuit for applying a testing current to said cable'circuit, a switching circuit includingfirst switching means for applying either direct current stepping pulses or-a predetermined number of 1 cycles of 'alternating currentswitching" pulses tosaid cablecircuit, second switching means for selectively connectin -either said testing circuit or-saidisw-itching. circuit into said cable circuit, andithird switching means coupled to said second switching means. whereby control signals are applied-:to: the cable circuit for a predetermined periodof :time,

13; A: submarine cable circuit; comprising a submersible repeater. interposed irra submerged portionof' said: cable .circuit andv including first switching means, said'firstswitchi g m n h 1 2 mg a plurality oi. switching positions. for' selectively providing azplurality'ot testingrand' operating conditions in' said cablet circuit, stepping means responsivetotstepping'pulses received over said'cabl'e circuit for-operating said first switch.- ing means fromone-to another of said switching positionsthereof; second switching means for selectively connecting either said first switching means or said stepping means'einto said cable circuit, operating means-responsive to a switching signal received" over. said" ca'blecircuit for operating said second. switching means and means for permanently connectingsaid operating means to said cable circuit, said operating means having electrical characteristics rendering it nonresponsive to intelligence" signals received over said cable' circuit; and a shoreistation comprising intelligence signaling apparatus, control signaling apparatus 7 and means for: connecting either said intelligence signaling apparatus. or said control signalin apparatus into saidi cable circuit, said control signaling apparatus comprising a testing circuit for applying'a testing current to said cable circuit? and including means for: indicating the connection provided by saicl second switching meansland theswitching'positionof said first switching means, a switching circuit including third switching' means for applying either said stepping pulses or said switching signal to said cable circuit and fourth: switchin means for selectively connecting either said testing circuit or: said swit'chingicircuit into said cable circuit.

141 A submarinecable circuit, comprising a submersible repeater having a:pluralit'y of amplifier circuits and being-interposed-in a submerged portion of said'cable' circuit'an'd including first switching means, saidfirst switching means having a plurality-ofswit'ching positions for selectively providing a plurality of testing, amplifying and operating conditions insaid cable circuit, stepping means responsive to stepping pulses received over said cable circuit" for operating said first switching means from one to another of said switchingpositions thereof, second switching-means for selectively connecting either said first switching means-or'said stepping means into said cable circuit, operating means responsive to a switching signal received over said cable circuit for operating'said second'switching means and means for permanently connecting said operating means tosaid cable circuit; saidoperating means having electrcalcharacteristics rendering it nonresponsiveto intelligencesignals received over saidcabl'e circuit, and'ashore-staticn comprising intelligencesignaling apparatus, control signaling apparatus and' m'eansqfor connecting either said intelligence" signaling-1 apparatus or said control signaling apparatus into said cable circuit; said control signaling apparatus com prising a: testing circuit' for applying a testing current to said' cable circuitand includinga current meter forindicatingthe connection provided by said second switchingmeans and the switching position: of 7 said first switching means; a switching circuitlincluding thirdswitchingmeans for'applying'either said stepping pulses orsaid switching signalto said' cable circuit and fourth'switching means-for selectively connecting either said testingcircuit or; said switching circuit into said cable circuit.

15. A shorestation for use With'a submarine cable circuit having 'a' submersible repeater-interposed? inla' submerged" portion thereof and including switching: apparatus havinga plurality "of J switching positions, comprising intelligence. signaling apparatus, control signaling apparatus, and means for connecting either said. intelligence signaling apparatus or said control signaling apparatus to said cable circuit, said control signaling apparatus comprising a testing circuit for applying a testing current to said cable circuit and including counting means for indicating the switching position of the switching apparatus of said submersible repeater, a switching circuit including first switching means for applying either stepping pulses or a switching signal to said cable circuit and second switching means for selectively connecting either said testing circuit or said switching circuit into said cable circuit.

FAY B. BRAMHALL. EARL L. NEWELL. PHILIP H. WELLS. CLIFFORD H. CRAMER.

References Cited in the file of this patent UNITED STATES PATENTS Number 

